I cant answer for cphasematch but I believe it uses a resolution
dependent phase analysis discussed by Woolfson and Lunin in the 1980s
and similar to the method used to calculate the MAPCC used in SHELXE
That checks for a possible origin shift as well as analysing
difference - but I presume
I am currently working with two of ccp4i's phase comparison software
packages, Phase Comparison(a clipper utility) and Phistats. I am
having a problem finding information concerning both how the programs
actaully analyze the data (since I find slightly different results
with each program) a
